function PopupCalendar(InstanceName)
{
    ///Global Tag
    this.instanceName=InstanceName;
    ///Properties
    this.separator="-"
    this.oBtnTodayTitle="Today"
    this.oBtnCancelTitle="Cancel"
    this.weekDaySting=new Array("S","M","T","W","T","F","S");
    this.monthSting=new Array("January","February","March","April","May","June","July","August","September","October","November","December");
    this.Width=200;
    this.currDate=new Date();
    this.today=new Date();
    this.startYear=1970;
    this.endYear=2010;
    ///Css
    this.normalfontColor="#666666";
    this.selectedfontColor="red";
    this.divBorderCss="1px solid #BCD0DE";
    this.titleTableBgColor="#98B8CD";
    this.tableBorderColor="#CCCCCC"
    ///Method
    this.Init=CalendarInit;
    this.Fill=CalendarFill;
    this.Refresh=CalendarRefresh;
    this.Restore=CalendarRestore;
    ///HTMLObject
    this.oTaget=null;
    this.oPreviousCell=null;
    this.sDIVID=InstanceName+"_Div";
    this.sTABLEID=InstanceName+"_Table";
    this.sMONTHID=InstanceName+"_Month";
    this.sYEARID=InstanceName+"_Year";
    this.sTODAYBTNID=InstanceName+"_TODAYBTN";
    
}
function CalendarInit()                ///Create panel
{
    var sMonth,sYear
    sMonth=this.currDate.getMonth();
    sYear=this.currDate.getYear();
    htmlAll="<div id='"+this.sDIVID+"' style='display:none;position:absolute;width:"+this.Width+";border:"+this.divBorderCss+";padding:2px;background-color:#FFFFFF'>";
    htmlAll+="<div align='center'>";
    /// Month
    htmloMonth="<select id='"+this.sMONTHID+"' onchange=CalendarMonthChange("+this.instanceName+") style='width:50%'>";
    for(i=0;i<12;i++)
    {            
        htmloMonth+="<option value='"+i+"'>"+this.monthSting[i]+"</option>";
    }
    htmloMonth+="</select>";
    /// Year
    htmloYear="<select id='"+this.sYEARID+"' onchange=CalendarYearChange("+this.instanceName+") style='width:50%'>";
    for(i=this.startYear;i<=this.endYear;i++)
    {
        htmloYear+="<option value='"+i+"'>"+i+"</option>";
    }
    htmloYear+="</select></div>";
    /// Day
    htmloDayTable="<table id='"+this.sTABLEID+"' width='100%' border=0 cellpadding=0 cellspacing=1 bgcolor='"+this.tableBorderColor+"'>";
    htmloDayTable+="<tbody bgcolor='#ffffff'style='font-size:13px'>";
    for(i=0;i<=6;i++)
    {
        if(i==0)
            htmloDayTable+="<tr bgcolor='" + this.titleTableBgColor + "'>";
        else
            htmloDayTable+="<tr>";
        for(j=0;j<7;j++)
        {

            if(i==0)
            {
                htmloDayTable+="<td height='20' align='center' valign='middle' style='cursor:hand'>";
                htmloDayTable+=this.weekDaySting[j]+"</td>"
            }
            else
            {
                htmloDayTable+="<td height='20' align='center' valign='middle' style='cursor:hand'";
                htmloDayTable+=" onmouseover=CalendarCellsMsOver("+this.instanceName+")";
                htmloDayTable+=" onmouseout=CalendarCellsMsOut("+this.instanceName+")";
                htmloDayTable+=" onclick=CalendarCellsClick(this,"+this.instanceName+")>";
                htmloDayTable+="&nbsp;</td>"
            }
        }
        htmloDayTable+="</tr>";    
    }
    htmloDayTable+="</tbody></table>";
    /// Today Button
    htmloButton="<div align='center' style='padding:3px'>"
    htmloButton+="<button id='"+this.sTODAYBTNID+"' style='width:40%;border:1px solid #BCD0DE;background-color:#eeeeee;cursor:hand'"
    htmloButton+=" onclick=CalendarTodayClick("+this.instanceName+")>"+this.oBtnTodayTitle+"</button>&nbsp;"
    htmloButton+="<button style='width:40%;border:1px solid #BCD0DE;background-color:#eeeeee;cursor:hand'"
    htmloButton+=" onclick=CalendarCancel("+this.instanceName+")>"+this.oBtnCancelTitle+"</button> "
    htmloButton+="</div>"
    /// All
    htmlAll=htmlAll+htmloMonth+htmloYear+htmloDayTable+htmloButton+"</div>";
    document.write(htmlAll);
    this.Fill();    
}
function CalendarFill()            ///
{
    var sMonth,sYear,sWeekDay,sToday,oTable,currRow,MaxDay,iDaySn,sIndex,rowIndex,cellIndex,oSelectMonth,oSelectYear
    sMonth=this.currDate.getMonth();
    sYear=this.currDate.getYear();
    sWeekDay=(new Date(sYear,sMonth,1)).getDay();
    sToday=this.currDate.getDate();
    iDaySn=1
    oTable=document.all[this.sTABLEID];
    currRow=oTable.rows[1];
    MaxDay=CalendarGetMaxDay(sYear,sMonth);
    
    oSelectMonth=document.all[this.sMONTHID]
    oSelectMonth.selectedIndex=sMonth;
    oSelectYear=document.all[this.sYEARID]
    for(i=0;i<oSelectYear.length;i++)
    {
        if(parseInt(oSelectYear.options[i].value)==sYear)oSelectYear.selectedIndex=i;
    }
    ////
    for(rowIndex=1;rowIndex<=6;rowIndex++)
    {
        if(iDaySn>MaxDay)break;
        currRow = oTable.rows[rowIndex];
        cellIndex = 0;
        if(rowIndex==1)cellIndex = sWeekDay;
        for(;cellIndex<currRow.cells.length;cellIndex++)
        {
            if(iDaySn==sToday)
            {
                currRow.cells[cellIndex].innerHTML="<font color='"+this.selectedfontColor+"'><i><b>"+iDaySn+"</b></i></font>";
                this.oPreviousCell=currRow.cells[cellIndex];
            }
            else
            {
                currRow.cells[cellIndex].innerHTML=iDaySn;    
                currRow.cells[cellIndex].style.color=this.normalfontColor;
            }
            CalendarCellSetCss(0,currRow.cells[cellIndex]);
            iDaySn++;
            if(iDaySn>MaxDay)break;    
        }
    }
}
function CalendarRestore()                    /// Clear Data
{    
    var i,j,oTable
    oTable=document.all[this.sTABLEID]
    for(i=1;i<oTable.rows.length;i++)
    {
        for(j=0;j<oTable.rows[i].cells.length;j++)
        {
            CalendarCellSetCss(0,oTable.rows[i].cells[j]);
            oTable.rows[i].cells[j].innerHTML="&nbsp;";
        }
    }    
}
function CalendarRefresh(newDate)                    ///
{
    this.currDate=newDate;
    this.Restore();    
    this.Fill();    
}
function CalendarCellsMsOver(oInstance)                /// Cell MouseOver
{
    var myCell = event.srcElement;
    CalendarCellSetCss(0,oInstance.oPreviousCell);
    if(myCell)
    {
        CalendarCellSetCss(1,myCell);
        oInstance.oPreviousCell=myCell;
    }
}
function CalendarCellsMsOut(oInstance)                ////// Cell MouseOut
{
    var myCell = event.srcElement;
    CalendarCellSetCss(0,myCell);    
}
function CalendarYearChange(oInstance)                /// Year Change
{
    var sDay,sMonth,sYear,newDate
    sDay=oInstance.currDate.getDate();
    sMonth=oInstance.currDate.getMonth();
    sYear=document.all[oInstance.sYEARID].value
    newDate=new Date(sYear,sMonth,sDay);
    oInstance.Refresh(newDate);
}
function CalendarMonthChange(oInstance)                /// Month Change
{
    var sDay,sMonth,sYear,newDate
    sDay=oInstance.currDate.getDate();
    sMonth=document.all[oInstance.sMONTHID].value
    sYear=oInstance.currDate.getYear();
    newDate=new Date(sYear,sMonth,sDay);
    oInstance.Refresh(newDate);    
}
function CalendarCellsClick(oCell,oInstance)
{
    var sDay,sMonth,sYear,newDate
    sYear=oInstance.currDate.getFullYear();
    sMonth=oInstance.currDate.getMonth();
    sDay=oInstance.currDate.getDate();
    if(oCell.innerText!=" ")
    {
        sDay=parseInt(oCell.innerText);
        if(sDay!=oInstance.currDate.getDate())
        {
            newDate=new Date(sYear,sMonth,sDay);
            oInstance.Refresh(newDate);
        }
    }
    sDateString=sYear+oInstance.separator+CalendarDblNum(sMonth+1)+oInstance.separator+CalendarDblNum(sDay);        ///return sDateString
    if(oInstance.oTaget.tagName.toLowerCase()=="input")oInstance.oTaget.value = sDateString;
    CalendarCancel(oInstance);
    return sDateString;
}
function CalendarTodayClick(oInstance)                /// "Today" button Change
{    
    oInstance.Refresh(new Date());        
}
function getDateString(oInputSrc,oInstance)
{
    if(oInputSrc&&oInstance) 
    {
        var CalendarDiv=document.all[oInstance.sDIVID];
        oInstance.oTaget=oInputSrc;
        CalendarDiv.style.pixelLeft=CalendargetPos(oInputSrc,"Left");
        CalendarDiv.style.pixelTop=CalendargetPos(oInputSrc,"Top") + oInputSrc.offsetHeight;
        CalendarDiv.style.display=(CalendarDiv.style.display=="none")?"":"none";    
    }    
}
function CalendarCellSetCss(sMode,oCell)            /// Set Cell Css
{
    // sMode
    // 0: OnMouserOut 1: OnMouseOver 
    if(sMode)
    {
        oCell.style.border="1px solid #5589AA";
        oCell.style.backgroundColor="#BCD0DE";
    }
    else
    {
        oCell.style.border="1px solid #FFFFFF";
        oCell.style.backgroundColor="#FFFFFF";
    }    
}
function CalendarGetMaxDay(nowYear,nowMonth)            /// Get MaxDay of current month
{
    var nextMonth,nextYear,currDate,nextDate,theMaxDay
    nextMonth=nowMonth+1;
    if(nextMonth>11)
    {
        nextYear=nowYear+1;
        nextMonth=0;
    }
    else    
    {
        nextYear=nowYear;    
    }
    currDate=new Date(nowYear,nowMonth,1);
    nextDate=new Date(nextYear,nextMonth,1);
    theMaxDay=(nextDate-currDate)/(24*60*60*1000);
    return theMaxDay;
}
function CalendargetPos(el,ePro)                /// Get Absolute Position
{
    var ePos=0;
    while(el!=null)
    {        
        ePos+=el["offset"+ePro];
        el=el.offsetParent;
    }
    return ePos;
}
function CalendarDblNum(num)
{
    if(num < 10) 
        return "0"+num;
    else
        return num;
}
function CalendarCancel(oInstance)            ///Cancel
{
    var CalendarDiv=document.all[oInstance.sDIVID];
    CalendarDiv.style.display="none";        
}